Method and Apparatus for Determining Status of Terminal Device, and Device

1. A method for determining a status of a terminal device, comprising: obtaining, by an access and mobility management network element, an access type used by the terminal device to access a network, wherein the access type comprises at least one of 3rd generation partnership project (3GPP) access and non-3GPP access; determining, by the access and mobility management network element, a connection management status of the terminal device, which indicates whether the terminal device is in a connected state or an idle state; determining, by the access and mobility management network element, a mode of the terminal device, wherein the mode of the terminal device is one of a plurality of modes, including a mobile initiated connection only (MICO) mode; and determining, by the access and mobility management network element, the status of the terminal device based on the access type used by the terminal device, the connection management status, and the mode of the terminal device, wherein the status of the terminal device is a loss-of-connectivity state or an available-to-connectivity state.

2. The method according to claim 1 , wherein the obtaining of the access type used by the terminal device to access the network comprises: determining, by the access and mobility management network element, a server accessed by the terminal device; and obtaining, by the access and mobility management network element, an access type used by the terminal device to access the server as the access type used by the terminal device to access the network.

3. The method according to claim 2 , wherein the obtaining of the access type used by the terminal device to access the server comprises: receiving, by the access and mobility management network element, an access type that is sent by the terminal device and that is used by the terminal device to access the server.

4. The method according to claim 2 , wherein the determining of the status of the terminal device comprises: determining, by the access and mobility management network element, a status of the terminal device corresponding to the server based on the status of the terminal device in the access type.

5. The method according to claim 2 , wherein the access type used by the terminal device to access the network comprises the 3GPP access and the non-3GPP access, the access type used by the terminal device to access the server is the 3GPP access, and the determining of the status of the terminal device corresponding to the server comprises: determining, by the access and mobility management network element, that the status of the terminal device in the 3GPP access is the loss-of-connectivity state when the terminal device is in the MICO mode and an idle state or when the terminal device is located in a restricted service area.

6. The method according to claim 2 , wherein the access type used by the terminal device to access the network is the 3GPP access and the non-3GPP access, the access type used by the terminal device to access the server is the non-3GPP access, and the determining of the status of the terminal device corresponding to the server comprises: determining, by the access and mobility management network element, that the status of the terminal device corresponding to the server is the available-to-connectivity state when the terminal device is in a connected state; determining, by the access and mobility management network element, that the status of the terminal device corresponding to the server is the loss-of-connectivity state when the terminal device is in an idle state; determining, by the access and mobility management network element, that the status of the terminal device corresponding to the server is the available-to-connectivity state when the terminal device is in an idle state and the terminal device can access the server by using a 3GPP technology; or determining, by the access and mobility management network element, that the status of the terminal device corresponding to the server is the loss-of-connectivity state when the terminal device is in an idle state and the terminal device cannot access the server by using a 3GPP technology.

7. The method according to claim 2 , wherein after the determining of the status of the terminal device, the method further comprises: sending, by the access and mobility management network element, the status of the terminal device to the server; or sending, by the access and mobility management network element to the server, the status of the terminal device and the access type used by the terminal device to access the server.

8. The method according to claim 1 , wherein the obtaining of the access type used by the terminal device to access the network comprises: receiving, by the access and mobility management network element, an access type that is sent by a network device and that is used by the terminal device to access the network, wherein the network device comprises at least one of a server, a network exposure function network element, a policy control function network element, and or a database.

9. The method according to claim 8 , wherein before the receiving of the access type that is sent by a network device and that is used by the terminal device to access the network, the method further comprises: sending, by the access and mobility management network element, identification information of the terminal device to the network device.

10. The method according to claim 8 , wherein before the obtaining of the access type used by the terminal device to access a network, the method further comprises: receiving, by the access and mobility management network element, identification information of the server that is sent by the server, the network exposure function network element, or the policy control function network element.

11. The method according to claim 1 , wherein the determining of the status of the terminal device comprises: determining, by the access and mobility management network element, that the status of the terminal device is the available-to-connectivity state when the access type used by the terminal device to access the network is the 3GPP access and the non-3GPP access, and the terminal device in the 3GPP access and/or the non-3GPP access is in the available-to-connectivity state; or determining, by the access and mobility management network element, that the status of the terminal device is the loss-of-connectivity state when the access type used by the terminal device to access the network is the 3GPP access and the non-3GPP access, and the terminal device in both the 3GPP access and the non-3GPP access is in the loss-of-connectivity state.

12. The method according to claim 1 , wherein the determining of the status of the terminal device in the access type comprises: determining, by the access and mobility management network element, that the status of the terminal device in the 3GPP access is the loss-of-connectivity state when the access type used by the terminal device to access the network is the 3GPP access, the terminal device is in the MICO mode and an idle state or when the terminal device is located in a restricted service area.

13. The method according to claim 1 , wherein the access type used by the terminal device to access the network is the non-3GPP access, and the determining of the status of the terminal device in the access type comprises: determining, by the access and mobility management network element, that the status of the terminal device in the non-3GPP access is the loss-of-connectivity state when the terminal device is in an idle state; or determining, by the access and mobility management network element, that the status of the terminal device in the non-3GPP access is the available-to-connectivity state when the terminal device is in a connected state.

14. A method of determining a status of a terminal device, comprising: obtaining, by an access and mobility management network element, first information of the terminal device, wherein the first information comprises location information of the terminal device, and a protocol data unit (PDU) session state of the terminal device in a local area data network (LADN), wherein the location information of the terminal device indicates whether the terminal device is located within a restricted service area; and determining, by the access and mobility management network element, the status of the terminal device based on the first information, wherein the status comprises at least one of a loss-of-connectivity state and an available-to-connectivity state.

15. The method according to claim 14 , wherein the determining, of the status of the terminal device based on the first information comprises: determining, by the access and mobility management network element, a server accessed by the terminal device; and determining, by the access and mobility management network element, the status of the terminal device based on the location information of the terminal device and a service area of the LADN if a data network corresponding to the server is the LADN.

16. The method according to claim 15 , wherein the determining of the status of the terminal device based on the location information of the terminal device and a service area of the LADN comprises: obtaining, by the access and mobility management network element, the service area of the LADN; and determining, by the access and mobility management network element, that the status of the terminal device is the available-to-connectivity state if the terminal device is located within the service area of the LADN; or determining, by the access and mobility management network element, that the status of the terminal device is the loss-of-connectivity state if the terminal device is located outside the service area of the LADN.

17. The method according to claim 14 , wherein the determining of the status of the terminal device based on the first information comprises: determining, by the access and mobility management network element, that the status of the terminal device is the available-to-connectivity state when the PDU session state of the terminal device in the LADN is an available state; or determining, by the access and mobility management network element, that the status of the terminal device is the loss-of-connectivity state if the PDU session state of the terminal device in the LADN is an unavailable state.

18. An apparatus for determining a status of a terminal device, comprising: a processor; a memory coupled to the processor, and storing program instructions, which, when executed by the processor, cause the processor to perform operations: obtaining an access type used by the terminal device to access a network, wherein the access type comprises at least one of 3rd generation partnership project (3GPP) access and non-3GPP access; determining a connection management status of the terminal device, which indicates whether the terminal device is in a connected state or an idle state; determining a mode of the terminal device, wherein the mode of the terminal device is one of a plurality of modes, including a mobile initiated connection only (MICO) mode; and determining the status of the terminal device based on the access type used by the terminal device, the connection management status, and the mode of the terminal device, wherein the status of the terminal device is a loss-of-connectivity state or an available-to-connectivity state.

19. The apparatus according to claim 18 , the operations further comprising: determining a server accessed by the terminal device; and obtaining an access type used by the terminal device to access the server.